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Simplifying
764.1504 = 4 * 3.14r * r
Multiply 4 * 3.14
764.1504 = 12.56r * r
Multiply r * r
764.1504 = 12.56r2
Solving
764.1504 = 12.56r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-12.56r2' to each side of the equation.
764.1504 + -12.56r2 = 12.56r2 + -12.56r2
Combine like terms: 12.56r2 + -12.56r2 = 0.00
764.1504 + -12.56r2 = 0.00
Add '-764.1504' to each side of the equation.
764.1504 + -764.1504 + -12.56r2 = 0.00 + -764.1504
Combine like terms: 764.1504 + -764.1504 = 0.0000
0.0000 + -12.56r2 = 0.00 + -764.1504
-12.56r2 = 0.00 + -764.1504
Combine like terms: 0.00 + -764.1504 = -764.1504
-12.56r2 = -764.1504
Divide each side by '-12.56'.
r2 = 60.84
Simplifying
r2 = 60.84
Take the square root of each side:
r = {-7.8, 7.8}
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